diff --git a/app/src/main/java/eu/faircode/email/Helper.java b/app/src/main/java/eu/faircode/email/Helper.java
index 70746ae749..63b342cde8 100644
--- a/app/src/main/java/eu/faircode/email/Helper.java
+++ b/app/src/main/java/eu/faircode/email/Helper.java
@@ -653,7 +653,7 @@ public class Helper {
             return true;
 
         if ("application/octet-stream".equals(type) &&
-                "winmail.dat".equals(name))
+                "winmail.dat".equalsIgnoreCase(name))
             return true;
 
         return false;